<script lang="ts" setup name="XtxCarousel">
import {onMounted, onUnmounted, PropType,ref, toRefs} from 'vue'
import {BannerItem} from '@/types/data'
const porps = defineProps({
  slides: {
    type:Array as PropType<BannerItem[]>,
    required:true
  },
  autoplay:{
    type:Boolean,
    default:false
  },
  duration:{
    type:Number,
    default:3000
  }
})
const {slides,autoplay,duration} = toRefs(porps)
const active = ref(0)
const onPrev = () => {
  active.value--
  // active.value的值要是小于0 就让active.value等于porps.slides.length - 1 也就是5-1 的话 就到最后一张
  if(active.value < 0) {
    active.value = slides.value.length -1
  }
}
const onNext = () => {
  active.value++
    //  active.value的值要是大于等于porps.slides.length  也就是5 的话  就active.value等于0 回到第一张
  if(active.value >= slides.value.length) {
    active.value = 0
  }
}
const play = () =>  {
  if(!autoplay.value) return
 clearInterval(timer)
 timer = window.setInterval(()=>{
    onNext()
  },duration.value)
}
const stop = () =>  {
  clearInterval(timer)
}
// 定时器逻辑，控制轮播
let timer:number = -1
 onMounted(()=> {
  play()
})
onUnmounted(() => {
  stop()
})
</script>

<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="play">
    <!-- 轮播图主题 -->
    <ul class="carousel-body">
      <li class="carousel-item " :class="{fade:active === index}" v-for="(item,index) in slides" :key="item.id">
        <RouterLink to="/">
          <img
            :src="item.imgUrl"
            alt=""
          />
        </RouterLink>
      </li>
      <li class="carousel-item">
        <RouterLink to="/">
          <img
            src="http://yjy-xiaotuxian-dev.oss-cn-beijing.aliyuncs.com/picture/2021-04-15/1ba86bcc-ae71-42a3-bc3e-37b662f7f07e.jpg"
            alt=""
          />
        </RouterLink>
      </li>
      <li class="carousel-item">
        <RouterLink to="/">
          <img
            src="http://yjy-xiaotuxian-dev.oss-cn-beijing.aliyuncs.com/picture/2021-04-15/1ba86bcc-ae71-42a3-bc3e-37b662f7f07e.jpg"
            alt=""
          />
        </RouterLink>
      </li>
    </ul>
    <!-- 左箭头 -->
    <a href="javascript:;" class="carousel-btn prev"
    @click="onPrev"
      ><i class="iconfont icon-angle-left"></i
    ></a>
    <!-- 右箭头 -->
    <a href="javascript:;" class="carousel-btn next"
    @click="onNext"
      ><i class="iconfont icon-angle-right"></i
    ></a>
    <!-- 小圆点 -->
    <div class="carousel-indicator">
      <span @mouseenter="active = index" :class="{active:active === index}" v-for="(item,index) in slides" :key="item.id"></span>
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
